update project version to 3.8
update project version to 3.8

umar456/arrayfire,9prady9/arrayfire,9prady9/arrayfire,9prady9/arrayfire,umar456/arrayfire,arrayfire/arrayfire,umar456/arrayfire,arrayfire/arrayfire,umar456/arrayfire,arrayfire/arrayfire,9prady9/arrayfire,arrayfire/arrayfire